MK2 VTR Sports Cat

1. James93 Frequent Poster Joined: Dec 2012 Gravesend, Kent Posts: 727 106 GTi, MK2 Saxo VTR, Corsa C SXi,

   #1 12th December 2012, 00:30

   Hi,
   
   I've just got a MK2 VTR, and got a Group N backbox w/ straight through centre section today, the only thing its missing now is a Manifold, i ran decat on my old car but not worth the hassle now a days, but love the rasp/pops of decat, would you get the same sorta noise with a 4-2-1 mani and get a sport cat welded in my middle section? means its safe for roadside checks etc and dont have to faff around for MOT time.
   
   Any ideas? thanks
2. jasonmayall Established Member Joined: Mar 2011 Birmingham Posts: 2148 Rover BRM, Rover 800 Coupe, Mk6 golf.

   #2 12th December 2012, 13:10

   I ran a sports cat on my old system, with only the back box as a silencer and it popped and banged all day - drove me fucking nuts lol.
   
   Passed an MOT though.
3. m4tt274 Saxperience Forum Bum Joined: Sep 2011 Doncaster Posts: 2627 Fabia VRS, mk1 fiesta + some others

   #3 12th December 2012, 14:37

   Quote:

   Originally Posted by jasonmayall Passed an MOT though.

   about that! :')
   
   the sports cat silences alot. Going from a 4/2/1 supersprint to 4/1 sports cat, supersprint back box im at least 10db quieter. I dont get many pops either in comparison.
   
   the decat is worth while. they sound much better for it.
4. James93 Frequent Poster Joined: Dec 2012 Gravesend, Kent Posts: 727 106 GTi, MK2 Saxo VTR, Corsa C SXi,

   #4 12th December 2012, 17:53

   Quote:

   Originally Posted by jasonmayall I ran a sports cat on my old system, with only the back box as a silencer and it popped and banged all day - drove me fucking nuts lol. Passed an MOT though.

   What system did you have fella?
   
   i was thinking of geting a 4-2-1 manifold and get a mk1 centre section and get the cat cut out and weld a sports cat in its place; would that work? ive heard sports cats still pop and bang.. well ive read that from a google search; are the lamda sensors etc the same? i ran decat on my corsa and sounded epic it banged when changing from 1-2 and 2-3, i miss the sound but driving a saxo and going places like lakeside.. im bound to get pulled and knowing my luck get caught out!
5. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

   #5 12th December 2012, 19:31

   Quote:

   Originally Posted by m4tt274 about that! :') the sports cat silences alot. Going from a 4/2/1 supersprint to 4/1 sports cat, supersprint back box im at least 10db quieter. I dont get many pops either in comparison. the decat is worth while. they sound much better for it.

   a centre silencer is cheaper and wont rob power..
6. James93 Frequent Poster Joined: Dec 2012 Gravesend, Kent Posts: 727 106 GTi, MK2 Saxo VTR, Corsa C SXi,

   #6 12th December 2012, 23:14

   what do u mean buddy? centre cat or what?
7. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

   #7 13th December 2012, 10:13

   Your cat is a restriction in the system. Its a series of small holes the gases are forced to go through. A sports cat will have less but still potentially will have an effect on power.
   If you are trying to kill the noise level then get a centre straight through silencer which will have virtually no effect on power.
   Personally I would keep a standard cat for MOT time and swap straight after for 364 days of the year.
8. James93 Frequent Poster Joined: Dec 2012 Gravesend, Kent Posts: 727 106 GTi, MK2 Saxo VTR, Corsa C SXi,

   #8 13th December 2012, 13:40

   No no i want the decat noise/rasp; not to kill it.. but running decat is bait with roadside vosa checks etc, do sport cats sound any different to normal cats?
9. m4tt274 Saxperience Forum Bum Joined: Sep 2011 Doncaster Posts: 2627 Fabia VRS, mk1 fiesta + some others

   #9 13th December 2012, 14:14

   they aren going to take your car apart at the side of the road.
   tell them it has a cat...? saxsport has a dummy cat.
10. KamRacing Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)

    #10 13th December 2012, 14:44

    Quote:

    Originally Posted by James93 No no i want the decat noise/rasp; not to kill it.. but running decat is bait with roadside vosa checks etc, do sport cats sound any different to normal cats?

    we are arguing semantics of wording. The silencer is a better option for power and is cheaper. A straight through design not going to stop pops and bangs but will drop the noise by 10-12db
    
    You may not get the same noise with a sports cat. It affects the sound waves as they have to negotiate a lot of small holes
    
    As for VOSA - when have you ever seen VOSA doing significant roadside checks? For piece of mind go for a sports cat but other than being road legal it will never be better.
11. user_29491 Saxperience Forum Bum Joined: Dec 2008 Lancs Posts: 4124 JP4S'd R.

    #11 13th December 2012, 15:03

    Seen VOSA in my small hometown 5 times this year.
    
    Easily solved though.. as they're always on the same road / place. And plenty of alternative routes around it
12. James93 Frequent Poster Joined: Dec 2012 Gravesend, Kent Posts: 727 106 GTi, MK2 Saxo VTR, Corsa C SXi,

    #12 13th December 2012, 18:37

    VOSA are around alot where i live, especially when we go cruises like Lakeside and MCE, might go saxsport with dummy cat tbh